How to detect if the gears are concentric 5

Generally, the indexing circle, and the base section garden is, the accuracy of the hob is determined, if the accuracy of the hob is low, it will not be concentric.

It can be inspected on a cart or turntable.

There are teeth on the rim that continuously engage mechanical elements that transmit motion and power. The application of gears in transmission has been around for a long time. At the end of the 19th century, the principle of the developed tooth cutting method and the special machine tools and tools that used this principle for cutting teeth appeared one after another, and with the development of production, the stability of gear operation was emphasized.

Is the phenomenon of tightening and loosening you mentioned felt, or is it measured by the testing instrument? Because the chord tooth thickness, accuracy, concentricity, etc. will be affected. A simple way is to feel the tight and loose positions and mark them, and you can easily determine the cause by the distribution.

If it comes to the detection of concentricity, the tooth shaping can be roughly detected by hitting the root circle with a dial gauge, but it needs to be detected one by one, which is more troublesome; It's hard to say if the mold comes out. At the end of the day, finding a tooth profile tester to test everything comes out.

Concentricity is the shape and position tolerance, with the length measurement tool is certainly not achievable, at least I am also seeking, if there is a condition, you can go on the yuan car or turntable for detection, as for the phenomenon of a tight and loose, I think it is caused by the accuracy of the gear is not enough, whether it is a mold or a gear shaping for gear processing, the accuracy is not very high.

The mating clearance of the gears is too large.

There are usually two types of gear inspection, one is analytical and the other is functional.

Analytical testing, commonly known as single detection, generally includes tooth orientation, common normal and variation, radial runout, base joint deviation, circumferential node accumulation error, etc. This detection method requires special measuring tools and testing instruments, so some small processing enterprises can not detect (mainly gear detectors for tooth shape and tooth direction detection).

Functional testing is also called comprehensive testing, which requires a measuring instrument, which is much cheaper than the tooth profile and tooth direction detector, and is more suitable for large-scale testing with low accuracy requirements. The measured gear is detected by using the standard gear (the general accuracy is about 4 and 5 grades) that already knows the accuracy, because the accuracy of the standard gear is higher than that of the measured gear, so the detected deviation is considered to be the machining error of the measured part.

The following indicators are usually detected: center distance and change, single tooth radial comprehensive error, one week radial comprehensive error, in addition, the state of meshing can be judged according to the colorant, and the shape and position of the contact spot can be used to judge the accuracy of the part.

According to the involute cylindrical gear accuracy GB10095-88 main tolerance items measurement and testing. Sometimes it is marked on the gear drawing.

The gears are generally made of low-carbon alloy structural steel, and the process - blanking, annealing, die punching, carburizing or nitrogen quenching, tempering, and finishing inspection. Metallographic examination, the surface structure of the heart (including the decarburized and carburized layer) can be added to make a hardness, and the chemical composition warranty can be referred to on the warranty. Then there is a dimensional inspection qualified packaging storage.

Gear inspection: In addition to the inspection of conventional dimensions, it is about the accuracy inspection of gear parameters and inspection items.

Focus on the gear inspection items: in the upper right corner of the gear parts diagram, there are gear parameters**, indicating the gear parameters. The contents related to gear inspection include tooth shape, tooth direction, ring gear runout, common normal length (number of spanned teeth), m value (measuring rod diameter), common normal length change, etc.

And all correspond to the corresponding tolerance values. The tolerance values of the inspection items for these gears are given, do not need to be calculated, and there are standards. The inspection of tooth shape and tooth direction requires special measuring equipment (very valuable); Ring gear runout is measured with a deflection meter; The common normal is measured with a common normal micrometer; The m-value is measured with a micrometer.

1.Rapid Determination of Gear Wear.

The degree of gear wear can be determined by using a test disc that measures gear wear and is based on a large amount of data that can be used as a control. During the inspection, it is only necessary to open the sprocket shaft cover of the sub-speed shaft, and fix the detection disc with two removed screws, and then place a small magnetic pointer on the sub-variable shaft core, and the pointer rotates with the sub-variable shaft. When measuring, the front and back of the drive wheel are plugged with stones to improve the detection accuracy.

Select the gear, turn the pulley in the forward direction to eliminate the gap of each gear pair, at this time, the point will be aimed at the "0" point on the disc, and then, turn the pulley in the opposite direction until it is difficult to rotate (eliminate all transmission clearance) or when the tire starts to rotate, then the reading of the pointer is the comprehensive clearance angle of the gear. Usually tested twice. After completing one gear, change gears, and again, measure the overall clearance angle of the other gear until all gears have been measured.

Some tractors should not remove the sprocket shaft cover, and the detection disc can be attached to the pulley with two magnets and rotate with the pulley. The pointer is attached to the fender and the combined clearance angle of each gear can also be measured. Due to the change of the transmission ratio and the influence of the chain, the measured data has changed slightly, but it can still basically reflect the actual situation.

1 Rapid determination method of bearing wear.

Detecting bearing clearance by lead pressing is more accurate than detecting with feeler gauge, but it is more cumbersome.

The aluminum wire used in the test should be soft, the diameter should not be too large or too small, the ideal diameter is a multiple of the gap, and the soft lead wire is usually used for detection in actual work.

When testing, first open the bearing cover, select the lead wire of the appropriate diameter, cut it into 15 40 mm long segments, put it on the journal and the interface of the upper and lower bearings, cover the bearing cover, tighten the fixing bolt according to the specified torque, and then loosen the bolt, remove the bearing cover, use a micrometer to detect the thickness of the flattened lead wire, and find the average value of the bearing top clearance.

If the top gap is too small, a pad can be added on the joint surface of the upper and lower tiles. If it is too large, reduce the pad, scrape or re-pour the tile.

In addition to the radial clearance, the plain bearing should also ensure the axial clearance. To detect axial clearance, the shaft is moved to an extreme position, and then the channeling momentum of the shaft from one extreme position to another is measured with a feeler gauge or dial gauge, i.e., axial clearance.

First, assemble the bearing to the motor shaft, then load the shaft into the motor stator, cover the end cover, install the fan blade, install the fan blade cover, and install the coupling joint. Next, the motor shaft is aligned with the concentricity. Generally, the light leakage alignment method is used.

Knowing the modulus m and the diameter d of the indexing circle can obtain the number of teeth z, that is, z=d m. If the number of teeth is calculated according to the transmission **, the equation should be supplemented by concentric conditions, and the diameter and radius will be used. z1 uses the radius and z2 uses the diameter, which add up to r3.

That is: r3=r1+d2. It is also possible to r3=r1+2 r2.

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